Backlight unit for blind spot warning lighting

Abstract

A backlight unit for blind spot warning lighting includes a printed circuit board (PCB) mounted with a light-emitting diode (LED), a bottom case having the PCB embedded on a lower portion thereof, and having an opened front surface, and a top case comprising a front plate covering a the front surface of the bottom case, and a guide protrusion formed to protrude backward from a rear surface of the front plate to guide the light from the LED to the front plate, and an object of the present disclosure is to provide a backlight unit, which can uniformly emit light while unifying the number of reflection and diffusion layers, and be advantageous for applying a hot wire, thereby improving visibility.

The invention claimed is: 
     
       1. A backlight unit for blind spot warning lighting comprising:
 a printed circuit board (PCB) mounted to a light-emitting diode (LED); 
 a bottom case having the PCB embedded on a lower portion thereof, and having an opened front surface; and 
 a top case comprising a front plate covering the opened front surface of the bottom case, and a guide protrusion protruding backward from a rear surface of the front plate to guide light from the LED to the front plate. 
 
     
     
       2. The backlight unit for blind spot warning lighting of  claim 1 , wherein the guide protrusion comprises:
 a guide part comprising a first side portion and a second side portion for guiding the light from the LED; and 
 a light incident part disposed upward from the LED; and 
 wherein the light incident part is positioned at a height lower than a height of a lower end of the guide part with respect to a height of the PCB. 
 
     
     
       3. The backlight unit for blind spot warning lighting of  claim 2 , wherein the light incident part is formed with a pattern. 
     
     
       4. The backlight unit for blind spot warning lighting of  claim 2 , wherein the guide protrusion further comprises an inclined part connected from both ends of the light incident part up to both lower ends of the guide part. 
     
     
       5. The backlight unit for blind spot warning lighting of  claim 4 , wherein the top case further comprises a rear plate having an outer circumferential surface formed along the rear surfaces of the guide part, the light incident part, and the inclined part. 
     
     
       6. The backlight unit for blind spot warning lighting of  claim 4 , further comprising an adhesive tape bonded to the front surface of the front plate of the top case, the adhesive tape having a plurality of transparent regions on which an image is displayed. 
     
     
       7. The backlight unit for blind spot warning lighting of  claim 6 , wherein one of the transparent regions of the adhesive tape is positioned at a location higher than the inclined part. 
     
     
       8. The backlight unit for blind spot warning lighting of  claim 5 , further comprising a reflector covering the guide protrusion and the rear plate, the reflector being inserted between inside surfaces of the top case and the bottom case. 
     
     
       9. The backlight unit for blind spot warning lighting of  claim 5 , wherein the front surface of the rear plate is formed with a pattern. 
     
     
       10. The backlight unit for blind spot warning lighting of  claim 9 , wherein a density of the pattern is different depending upon a distance from the light incident part. 
     
     
       11. The backlight unit for blind spot warning lighting of  claim 10 , wherein the pattern is denser as the distance from the light incident part increases. 
     
     
       12. The backlight unit for blind spot warning lighting of  claim 2 , wherein a distance between upper ends of the first side portion and the second side portion of the guide part is shorter than a distance between lower ends of the first side portion and the second side portion. 
     
     
       13. The backlight unit for blind spot warning lighting of  claim 2 , wherein the LED includes a plurality of LEDs, and the guide protrusion comprises a plurality of light incident parts corresponding to the plurality of LEDs. 
     
     
       14. The backlight unit for blind spot warning lighting of  claim 13 , wherein the guide protrusion further comprises a plurality of inclined parts inclined upward from both ends of each of the plurality of light incident parts. 
     
     
       15. A backlight unit for blind spot warning lighting comprising:
 a printed circuit board (PCB) mounted to a light-emitting diode (LED); 
 a bottom case having the PCB embedded on a lower portion thereof, and having an opened front surface; and 
 a top case comprising a front plate covering the front surface of the bottom case, a guide protrusion protruding backward from a rear surface of the front plate, and a rear plate having an outer circumferential surface formed along the rear surface of the guide protrusion. 
 
     
     
       16. The backlight unit for blind spot warning lighting of  claim 15 , wherein the guide protrusion comprises:
 a guide part comprising a first side portion and a second side portion for guiding the light from the LED; and 
 a light incident part disposed upward from the LED, 
 wherein the light incident part is positioned at a height lower than a height of a lower end of the guide part with respect to a height of the PCB. 
 
     
     
       17. The backlight unit for blind spot warning lighting of  claim 16 , wherein the guide protrusion further comprises an inclined part connected from both ends of the light incident part up to both lower ends of the guide part. 
     
     
       18. The backlight unit for blind spot warning lighting of  claim 16 , wherein a distance between upper ends of the first side portion and the second side portion of the guide part is shorter than a distance between lower ends of the first side portion and the second side portion. 
     
     
       19. The backlight unit for blind spot warning lighting of  claim 16 , further comprising an adhesive tape bonded to the front surface of the front plate of the top case, and having a plurality of transparent regions on which an image is displayed. 
     
     
       20. The backlight unit for blind spot warning lighting of  claim 16 , wherein the light incident part and the rear plate are formed with patterns.